Grate for mechanical stokers.



P. M. CLARK. GRATE FOB. MECHANICAL STOKERS.

APPLICATION FILED SEPT. 11, 1911.

Patented Jan. 19, 1915.

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ATTORNEY THE NORRIS PETERS ca, EHOTO-LITHO., WASHING TON. D C

@NI STATES PATENT ()FFIQE.

FRANCIS MORTON CLARK, OF GARDEN CITY, NEW YORK, ASSIGNOR TO MULTIPLE-GRATE-BAR ENDLESS CHAIN STOKER COMPANY, A CORPORATION OF NEW YORK.

GRATE FOR MECHANICAL STOKERS.

Application filed September 11, 1911.

To all whom it may concern:

Be it known that I, FRANCIS MORTON CLARK, a citizen of the UnitedStates, residing at Garden City, in the county of Nassau and State ofNew York, have mvented a certain new and useful Improvement in Gratesfor Mechanical Stokers, of which the following is a full, clear, andexact description.

My invention relates to improvements in grates for mechanical stokers ofthe endless traveling grate type, in which the grate is mounted onendless conveyor chains carried on sprocket Wheels mounted in the foreand rear parts of the furnace.

The objects of my invention are to provide a grate composed of sectionswhich shall be easily and conveniently attachable to and detachable fromthe conveyer chains and which sections,being exactly alike, shall bereversible and interchangeable; to pro vide a grate which may beextended to any desired breadth by the addition of further chains andsections or by substituting sections of difierent length, and whichshall be economical to construct and operate; and to obtain such otheradvantages and results as may be brought out in the followingdescription and claims. I attain these objects by the constructionillustrated in the accompanying drawing, in which Figure 1 is a sideView of the rlght hand end and a portion of the middle of a grate barconstructed according to my invention, showing vertical links of twochains in section; Fig. 2 is an enlarged end View of said grate bar,showing several links of the chain to which it is attached; Fig. 3 showsin plan a part of the right hand end of two adjacent bars; Fig. t is asimilar view of two bars where sections join; Fig. 5 is an enlargedperspective of one of the links employed in joining grate bars to theconveyer chains; Fig. 6 is an enlarged perspective of a pin which isused to give stiffness to the grate bar where grate bar sections oin.

Each grate bar A, B, and so on through the series, is composed of two ormore sections 5, 6 and so forth, and all grate bar sections are exactlyalike. Each is formed with a web 7 and, in the form chosen for thepurpose of illustration with staggered, intermeshing teeth 8, so as tobe self cleaning.

Each grate bar section is provided at each Specification of LettersPatent.

Patented J an. 19,1915.

Serial No. 648,802.

end with a half-notch 9 and adjacent each end with a full notch 10. Thenotches 10, or a pair of half-notches 9 when two bar sections are joinedend to end, form an opening of such dimensions as to easily receive theupper leg of a vertical link X of a chain XY. These notches are shown asbeing rectangular in cross section but it will be readily understoodthat they may be of any desired shape to permit of the use stated.Adjacent each end of each bar section and between half-notch 9 and notch10, and also at the sides of notches 10 toward the middle of the bar andat like distances from said notches are formed holes 11 through the web7 (preferably by drilling). Considering only one end of the bar section,the distance between centers of holes 11 is equal to the distancebetween centers of holes 1% in the shanks 15 of link L; and the centerof the first hole 11 is at a distance from the end of the grate barsection equal to one-half the distance between the centers of holes 14.

i In the drawings I have shown only the right hand bar section and aportion of one of the intermediate sections, of which it will be readilyunderstood as many as desired to give the proper width of grate may beemployed. When, as is the case at the right of the drawing the sectionis to be an end one, the upper leg of vertical link X of the chain XY isplaced in the notch 10. Then links L (shown in enlarged View in Fig. 5)are passed through the vertical link of the chain, one on either side ofthe web 7 of the bar section, and are secured in place by pins 12inserted through holes 11 of the web and 14 of the links, and held inplace by cotter pins 16.

If, as shown at the left hand side of Fig. 1, the chain is one of theintermediate ones, it is joined to the sections at their juncture. Thelink X fits in the opening formed by two half-notches 9 and the pair oflinks L pass through the chain links X and join the bar sections, thepins 12 fitting into the holes 11 nearest the bar section ends.

In order to give stiffness to the grate bare it is desirable that therebe some connection between the sections other than the links L. In thedrawings I show each section as provided at each end with a recess 17and where sections are joined end to end, pins 18 are inserted in saidrecess 17 to give stiffness to the joint. While cylindrical recesses andpins are illustrated it is obvious that any form of detachablestiffening element entering correspondingly shaped recesses in the endsof the bar sections, may be employed Without departing from myinvention.

In the specification and claims I have, for the want of a moredescriptive word, re ferred to the cut out portion 9 as a halfnotch. Bythis term I intend to specify a recess, open on two sides, which recessalone is not sufliciently large 'to. receive a link of a conveyer chainbut which will cooperate with a similar recess on an abutting section toform a recess of approximately the same size as the notches l0 and, likesaid notches 10, capable of receiving a link of a conveyer chain. Theclaims should'be c011- strued in view of the limitations given the termhalfnotch in this paragraph.

lVhile I have illustrated a grate composed of intermeshing bars I do notlimit myself to that particular form of bar as any of the well knowntypes of bars may be employed without departing from my invention;

I do not claim to be the inventor of the generic idea of rendering agrate bar section interchangeable by providing near each end thereofmeans for attaching the section to a conveyer and elements of anattaching means adapted to cooperate with similar elements 011 anadjacent section, the first attaching means being adapted for use whenthe section is attached to an outside conveyer and the second attachingmeans being adapted for use when the section is attached to anintermediate conveyer, as such generic idea was invented by HarveyIserman and is claimed in his copending application, Serial Number648,745, filed Sept. 11, 1911. But I do claim to be the inventor of thespecific means for carrying out that generic idea shown in thisapplication.

Having thus described the invention, what I claim is 1. In an'endlesstraveling grate, a plurality of endless conveyer chains, a plurality ofgrate bars mounted transversely thereon, in combination with duplicateattaching links one on each side of said grate bars, said attachinglinks passing through the vertical links of the chains and beingattached at each end to the exterior of the body portion of the gratebar. I

2. In an endless traveling grate, a plurality of chains having gratebars mounted transversely thereon, each grate bar being composed of aplurality of webbed grate bar sections joined end to end, and duplicatemeans which pass through the chains and are fastened one on each side tothe web of the grate bar, for joining the sections one to another andattaching the grate bars to the chains.

'3. In an endless traveling'grate, a plurality of chains having gratebars mounted transversely thereon, each grate bar being composed of aplurality of. webbed grate bar sections joined end to end, and duplicateattaching means which pass through the vertical links of the chains andare fastened one on each side to the webs of the grate bars, theopposite ends of the attaching means being attached to diiierentabutting grate bar sections, for joining the' sections one to the otherand attaching the grate bars to the chains.

4. In an endless traveling grate, a plurality of conveyer chains withgrate bars mounted transversely thereon, each grate bar being composedof a plurality of longitudinally webbed grate bar sections joined end toend, each section having a plurality of holes transversely through itsweb, duplicate means passing through the chains and adapted to beattached to the ends of two abutting sections, and pins passing throughthe attaching means and through the holes in the webs of the sections.

5. In an endless traveling grate, a plurality of conveyer chains withgrate bars mounted transversely thereon, each grate bar being composedof a plurality of webbed grate bar sections joined end to end, eachgrate bar section having at each end a halfnotch, a transverse hole, afull notch and a transverse hole, arranged in the order named from theend toward the center of the bar section, whereby each grate bar sectionis adapted to be used either as an end or an intermediate section, thechains and bar sections being so relatively located that the side chainsare received into the notches adjacent the ends of the grate barsections and that the intermediate chains are received into the spaceformed by two half-notches at the juncture of the grate bar sections,duplicate detachable links, on opposite sides of the web of the barsections, passing through vertical links of the outside chains andattached to said bar sections by pins passing through the detachablelinks and the holes at one end of a grate bar section, and duplicatedetach able links passing through vertical links of the intermediatechains and attached to abutting grate bar sections by pins passingtherethrough and through the end holes in said abutting sections.

6. In a grate for mechanical stokers, the combination with a pluralityof endless chains, of grate bars mounted transversely thereon, saidgrate bars being composed of a pluralityvof webbed grate bar sections,each section having a half-notch at each end and a notch adjacent eachend, whereby each grate bar section is adapted to be used either as anend or an intermediate section, the chains and bar sections being sorelatively located that the side chains are received into sections,duplicate detachable links passing the notches adjacent the ends of thegrate bar sections and that the intermediate chains are received intothe space formed by two half-notches at the juncture of the grate barthrough vertical links of the chains and pins passing through bothdetachable links and the web of a grate bar section for attaching Copiesof this patent may be obtained for five cents each, by addressing theCommissioner of Patents,

Washington, D. 0.

